ATBECHDEDKESFRGBGRITLILUNLSE..PTIESI............................................JDIM350 (Ver 2.1 Jan 2001) 2100000/00976760EUROPEAN PATENT SPECIFICATIONB120021218EP99201985.1199410032000062120020411enenenMI93211319931005IT200212182002512000020220000520021218200251200204117 7C 07K 5/00 A 7A 01N 37/46 B 7A 01N 43/12 B 7A 01N 43/18 B 7A 01N 43/30 B 7A 01N 43/76 B 7A 01N 43/78 BdeOligopeptide mit fungizider AktivitätenOligopeptides with fungicidal activityfrOligopeptides ayant l'activité fongicideZABRISKIE, T.M. ET AL.: "Jaspamide, a modified peptide from a Jaspis spongem with insecticidal and antifungal activity" J. AM. CHEM. SOC., vol. 108, - 1986 pages 3123-3124, XP002126864GREGORY, H. ET AL.: "Polypeptides, part VII ..." J. CHEM. SOC.,1968, pages 531-540, XP00212686594202821.8065222919941003Camaggi, Giovanni20 Via Ragazzi del 9928100 NovaraITFilippini, Lucio13/A Via R.Morandi20097 San Donato Milanese, MilanITGusmeroli, Marilena31 Via della Guerrina20052 Monza, MilanITGaravaglia, Carlo7 Piazza della Vittoria20012 Cuggiono, MilanITSignorini, Ernesto51 Via Matteotti21046 Malnate, VareseITISAGRO S.p.A.0152786375604Via Felipe Casati, 2020124 MilanoITDe Gregori, Antonella00087231Ing. Barzano & Zanardo Milano S.p.A. Via Borgonuovo 1020121 MilanoITATBECHDEDKESFRGBGRIEITLILUNLPTSESI1999062220000308200010

The present invention relates to oligopeptidic compounds.

More particularly, the present invention relates to oligopeptidic compounds having high antifungal activity, to a process for preparing them and to their use in agricultural field as fungicides.

Therefore, the subject-matter of the present invention are oligopeptidic compounds having the general formula (I):

        K-[-A-]z-[-B-]w-L     (I)

wherein:

   or an halogen atom selected from fluorine,chlorine and bromine; suitable for use as antifungal agents in agriculture.

The structure having the general formula (I) contains two or more chiral centres. Purpose of the present invention is to take into consideration both isomerically pure compounds having general formula (I), as well as mixtures thereof.

The compounds having general formula (I) are. antifungal agents for agricultural purposes.

By "aromatic heterocyctic radical", an aromatic 5-membered or 6-membered heterocyclic radical is understood, which contains from one to three heteroatoms, which may be the same or different from each other, and are selected from nitrogen, oxygen and sulfur.

When a phenyl radical, an aromatic heterocyclic radical, a naphthyl radical or an aromatic benzofused five-membered heterocyclic radical containing from 1 to 2 heteroatoms, which may be the same or different from each other, is disclosed as being "optionally substituted", it should be understood that said radical may be substituted with one or more halogen atoms, which may be the same or different from each other, and are selected from fluorine, chlorine, bromine and iodine, or with one or more groups, which may be the same or different from each other, and are selected from either linear or branched C1-C5 alkyl or haloalkyl radicals, either linear or branched C1-C5 alkoxy or haloalkoxy radicals; C3-C6 cycloalkyl or cycloalkoxy radicals; C2-C5 carbalkoxy radicals; cyano radicals; methylene dioxyl radicals having the general formula (VI) : wherein:

When a phenoxy radical or a thiazolic radical is disclosed as being optionally substituted, it should be understood that said radical may be substituted with one or more halogen atoms, which may be the same or different from each other, selected from fluorine, chlorine, bromine and iodine, or with a methyl or trifluoromethyl radical.

Examples for Ra radicals, when Ra represents an alkyl radical, are: isopropyl, isobutyl, sec.-butyl, tert.-butyl, and so forth.

Examples for aminoacidic radicals A, when Ra represents an alkyl radical, are (in brackets, the short form is reported which is derived from the international symbology used for peptides): L-Valine (―L[Val]―), DL-Valine (―DL[Val]―), D-Valine (―D[Val]―), Leucine (―[Leu]―), Isoleucine (―[Ile]―), allo-Isoleucine (―a[Ile]―), tert.-Leucine (―[Tle]―), and so forth.

Examples of aromatic five-membered or hexa-membered heterocyctic radicals containing from one to three heteroatoms, which may be the same or different from each other, and are selected from nitrogen, oxygen and sulfur, are: pyridine, pyrimidine, pyrrole, imidazole, triazole, thiazole, oxazole, isooxazole, and so forth.

Examples of L, when X represents an oxygen atom, are: methoxy, ethoxy, isopropoxy, tert.-butoxy, benzyloxy, and so forth.

Examples of L, when X represents a ―N(R3)― moiety, are: methylamino, isopropylamino, butylamino, octylamino, N,N-dimethylamino, piperidyl, morphol-4-yl, benzylamino, 4-chlorobenzylamino, 2,4-dichlorobenzylamino, α-methyl-4-chlorobenzylamino, α-methyl-4-bromobenzylamino, α-methyl-4-methoxy-benzylamino, α--methyl-4-trifluoromethylbenzylamino, thiazol-2-ylamino, imidaz-2-ylamino, α-cyanobenzylamino, α-cyanoisopropylamino, α-carbomethoxyethylamino, α-carboisopropoxy-ethylamino,α-carbomethoxyisobutylamino, 2-carboisopropoxypyrrolid-1-yl, α-(N-methylcarbamoyl)ethylamino, α-carbamoylethylamino, 2-(N,N-dimethylcarbamoylpyrrolid-1-yl), 2-(N,N-dimethylcarbamoylpiperid-1-yl), and so forth.

Examples of L, when X represents an -N(R4)-O-moiety, are: methoxyamino, benzyloxyamino, N-methyl-N-benzyloxyamino, and so forth.

Examples of K, when Y represents an oxygen atom, are: carbomethoxy, carboisopropoxy, carboisobutoxy, carbo-tert.-butoxy, carbobenzyloxy, carbophenoxy, and so forth.

Examples of K, when Y represents a direct bond, are: acetyl, isobutanoyl, benzoyl, cyclopropanoyl, 2-methoxy-propanoyl, 2-acetamidopropanoyl, 2-carbomethoxyacetyl, and so forth.

A Compound having the general formula (I) not illustrated in the examples, but equally interesting for its fungicidal activity, is (the compound reported hereinunder, is represented in accordance to the international symbology used for peptides):

        Me2―CH―O―CO―[Val]―β[Phe]―NH―CH(Me)―pCl―phenyl;

The compounds of general formula (I) according to the present invention can be obtained by means of several processes.

When K is different from hydrogen, the compounds having general formula (I) can be obtained by means of a process which can be schematically shown as follows (i) : in which K, A, z, B and w have the same meaning as disclosed hereinabove (K different from hydrogen).

The above schematized condensation reaction (i), is carried out by causing the aminoacidic derivatives (VII) to react with a condensation agent such as, e.g., dicyclohexylcarbodiimide or carbonyldiimidazole, in the presence of a polar solvent, e.g., tetrahydrofuran, and subsequently adding the aminoacidic derivatives (VIII). The reaction is carried out at a temperature comprised within the range of from -10°C to room temperature.

After the addition of the aminoacidic derivative (VIII), the solution is kept with stirring during about 10-15 hours. The resulting compound having general formula (I) is usually purified by crystallization from a suitable solvent such as, e.g., ethylether, isopropylether, methanol, isopropanol, and so forth, or from a mixture of solvents such as, e.g., ethyl ether/methanol, ethyl acetate/hexane, and so forth.

When z is 1, the aminoacidic derivative (VIIa) is obtained by means of a process which- can be schematized as follows (ii) : in which K and A have the same meaning as indicated hereinabove (K different from hydrogen).

The condensation reaction (ii) schematized above, between chloride (IX) and the aminoacidic derivative (X) can be carried out both in the presence of protic solvents such as, e.g., water, and in the presence of such organic bases as, e.g., triethylamine or N,N―dimethylaniline as. well as in the presence of inorganic bases such as, e.g., sodium hydrogen carbonate, or sodium hydroxide, at a temperature comprised within the range of from -15°C, up to +25°C.

When w is 1, the aminoacidic derivative (VIIIa) is obtained by means of a process which can be schematically shown as follows (iv): in which B and L have the same meaning as disclosed above.

The reaction (iv) schematically shown above, between the aminoacidic derivative (XIII), protected at its aminic function by means of a benzylcarboxy (BOC) group and compound (XIV), is carried out by operating according to the same conditions as disclosed for the reaction shown Scheme (i). The protective group (BOC) on the resulting compound (XV) is subsequently removed by acidic hydrolysis in ethyl acetate, at room temperature, according to as reported in Bulletin of Chemical Society Japanese (1977), page 718.

When K stands for hydrogen, the compounds having general formula (I) can be easily obtained by treating a compound having general formula (XVII): wherein tBut indicates tert-butoxy, A, z, B, w and L have the same meaning as disclosed above, with an acidic solution af aqueous ethyl acetate, at room temperature, according to as reported in Bulletin of Chemical Society Japanese (1977), page 718.

[A] and [B] aminoacids, when they are not commercial products, can be prepared according to what disclosed in published papers, such as, e.g., in Houben-Weyl, "Methoden der Organischen Chemie", Vol. 15: Synthese von Peptiden I and II, (1974); Greenstein-Winitz, "Chemistry of The Aminoacids", (1961) John Wiley Inc.; Synthetic Communications (1993), pages 349-356; Tetrahedron Letters (1975), pages 4393-4394; Tetrahedron Letters (1988), pages 6465-6466.

The compounds having general formula (I) display particularly high fungicidal activity against phytopathogenic fungi which attack vine, sugar beet, cereal, cucurbits and orchard crops.

The plant diseases which can be combatted with the compounds having the general formula (I) according to the present invention are, e.g., the following:

The compounds having the general formula (I) are capable of displaying a fungicidal action with both curative and preventive character and, additionally, display a low toxicity for plants, or do not display any such toxicity at all.

For practical uses in agriculture, having available fungicidal compositions containing one or more compounds having general formula (I), possibly also as an isomer mixture, as the active substance, is often useful.

The application of these compositions can be carried out on any portions of the plant, e.g., on leaves, stems, branches and roots, or on the same seeds before sowing, or also to the locus on which the plant grows.

Compositions can be used which appear as dry dusts, wettable dusts, emulsified concentrates, microemulsions, pastes, granulates, solutions, suspensions, and so forth: the selection of the type of composition will depend on the specific use.

The compositions are prepared by any modalities known from the prior art, for example, by diluting or dissolving the active substance with a solvent means and/or a solid diluent, possibly in the presence of surfactants.

As solid diluents, or carriers, the following can be used: silica, China clay, bentonite, talc, fossil meal, dolomite, calcium carbonate, magnesia, chalk, clays, synthetic silicate, attapulgite, sepiolite.

As liquid diluents, of course beside water, several solvents can be used, e.g., aromatics (xylenes or mixtures of alkylbenzenes), chloroaromatics (chlorobenzene), paraffins (petroleum fractions), alcohols (methanol, propanol, butanol, octanol, glycerol), amines, amides (N,N―dimethylformamide, N―methylpyrrolidone), ketones (cyclohexanone, acetone, acetophenone, isoforone, ethylamylketone), esters (isobutyl acetate).

As surfactants, there can be used sodium, calcium, triethanolamine or triethylamine salts of alkylsulfonates, alkylarylsulfonates, polyethoxylated alkylphenols, fatty alcohols condensed with ethylene oxide, polyoxyethylated fatty acids, polyoxyethylated sorbitol esters, lignine sulfonates.

The compositions can also contain special additives for particular purposes such as, e.g., adhesion promoters, such as gum arabic, polyvinyl alcohol, polyvinylpyrrolidone.

If so desired, to the compositions according to the present invention also other compatible substances can be added, such as, e.g., fungicides, phytoregulants, antibiotics, herbicides, insecticides, fertilizers.

The concentration of active substance in the above said composition can vary within a wide range, according to the active compound, the crop, the pest, the environmental conditions and the adopted formulation type.

In general, the active substance concentration is comprised within the range of from 0.1% to 95%, preferably of from 0.5% to 90%.

The following examples are reported for illustrative purposes and shall not be construed as being Limitative of the present invention.

EXAMPLE 1 Syntesis of N-(tert.-butyloxycarbonyl)-L-valinyl-DL-β-phenyl-β-alanine ester (Compound No. 1 ).

An amount of 1.1 g of cyclohexylcarbodiimide was added to a solution, kept cooled at 0°C, obtained by mixing 0.9 g of tert.-butyloxycarbonyl-L-valine, 1.2 g of isopropyl 3-phenyl-3-aminopropanoate hydrochloride (β-pheny-β-alanine hydrochloride) and 0.46 g of triethylamine in 10 cm3 in metilene chloride.

After 1 hour at room temperature, the obtained solution is evaporated under reduced pressure and the resulting raw product is purified on silica, using a mixture of 3:7 ethyl acetate:hexane as the solvent.

1.5 g of desired compound is obtained in a yield of 85%. ([α]°(CH2Cl2) = - 13.80°).

EXAMPLES 2-41

By operating analogously to Example 1 the compound nos. 2-41 were prepared, the structures of which are reported in Tables 1-5 , together with their elemental analysis results.

EXAMPLE 42 Determination of preventive fungicidal activity against downy mildew of vines (Plasmopara viticola).

Leaves of vine plants cultivar Dolcetto, grown in pots inside a conditioned room (20±1°C, relative humidity 70%), are spray treated on both their leaf faces with compounds 1-41 in water-acetone solution at 20% acetone by volume.

After a 24-hour stay in conditioned environment, on both leaf faces of the plants, an aqueous suspension of conidia of Plasmopara viticola (200,000 conidia per cm3) is sprayed.

The plants are kept in a moisture saturated environment, at 21°C, during the fungus incubation time.

At the end of said time period (7 days), the fungicidal activity is evaluated according to a percent evaluation scale from 100 (healthy plant) to 0 (completely infected plant).

All synthetized compounds displayed a higher control rate than 90, at their use concentration of 500 ppm.

EXAMPLE 43. Determination of preventive fungicidal activity against cucumber powdery mildew (Sphaerotheca fuliginea).

Leaves of cucumber cultivar Marketer, grown in pots inside a conditioned room (20±1°C, relative humidity 70%), are spray treated on both their leaf faces with compounds 1-41 in water-acetone solution at 20% acetone by volume.

After a 24-hour stay in conditioned environment, on both leaf faces of the plants, an aqueous suspension of conidia of Sphaerotheca fuliginea (200,000 conidia per cm3) is sprayed.

The plants are kept in a moisture saturated environment, at 21 °C, during the fungus incubation time.

At the end of said time period (8 days), the fungicidal activity is evaluated according to a percent evaluation scale from 100 (healthy plant) to 0 (completely infected plant).

All synthetized compounds displayed a higher control rate than 90, at their use concentration of 1000 ppm.

Oligopeptidic compounds having the general formula (I):

        K-[-A-]z-[-B-]w-L     (I)

wherein: -- z and w are 1; -- A represents an aminoacidic portion having the general formula (II):    wherein: -- Ra represents a linear or branched C3-C4 alkyl radical; -- R' represents a hydrogen atom; -- B represents an aminoacidic portion having the general formula (III):    wherein: -- Rb represents a phenyl radical, an aromatic heterocyclic radical or a naphthyl radical, with said phenyl, heterocyclic and naphthyl radicals being also optionally substituted; an aromatic benzofused five-membered heterocyclic radical containing from 1 to 2 heteroatoms, which may be the same or different from each other, selected from nitrogen, oxygen and sulfur, with said aromatic benzofused five membered heterocyclic radical being also optionally substituted; -- m is 1 and n is 0; -- R" represents a hydrogen atom; -- L represents a moiety having the general formula (IV):    wherein: -- E represents an either linear or branched C1-C8 alkylene or haloalkylene chain; an omega-oxa-C2-C8 alkyl chain; or a direct linkage; -- R1 represents a hydrogen atom; a C3-C6 cycloalkyl radical; a phenyl radical, or an aromatic heterocyclic radical, with said phenyl and heterocyclic radicals being also optionally substituted; -- R2 represents a hydrogen atom; a Linear or branched C2-C6 carboxyalkyl radical; a linear, branched or cyclic C2-C6 carbamoyl radical; a cyano radical; or an halogen atom selected from fluorine, chlorine and bromine -- X represents an ―O― moiety; a ―N(R3)― moiety or a ―N(R4)―O― moiety; wherein: -- R3 represents a hydrogen atom; a C1-C3 alkyl or alkoxy radical; or, together with R1, represents a direct Linkage or a C2-C4 alkylene chain; -- R4 represents a hydrogen atom; a C1-C3 alkyl radical; or, together with R1, represents a direct linkage; -- K represents a hydrogen atom; an either linear or branched C1-C4 alkyl radical; or a protective group having the general formula (V): wherein: -- Y represents an oxygen atom; or a direct Linkage; -- M represents an either linear, branched or cyclic C1-C8 alkylene or haloalkylene chain; or a direct linkage; -- R5 represents a hydrogen atom; an optionally substituted phenyl radical; an optionally substituted phenoxy radical; an optionally substituted thiazolic radical; a linear, branched or cyclic C2-C6 carbamoyl radical; a linear, branched or cyclic C1-C6 carbalkoxy radical; or a cyano radical; -- R6 represents a hydrogen atom; a C1-C3 alkoxy or haloalkoxy radical; an acetate radical; an acetamidic radical; or an halogen atom selected from fluorine, chlorine and bromine; suitable for use as antifungal agents in agriculture. Compounds according to claim 1, in which the aromatic heterocyclic radical, is a 5- or 6-membered aromatic heterocyclic radical containing from 1 to 3 heteroatoms, which may be the same or different from each other, selected from nitrogen, oxygen and sulfur. Compounds according to claim 1, in which the phenyl radical, the aromatic heterocyclic radical, the naphthyl radical or the aromatic benzofused five membered heterocyclic radical containing from 1 to 2 heteroatoms, which may be the same or different from each other, are substituted with one or more halogen atoms, which may be the same or different from each other, and are selected from fluorine, chlorine, bromine and iodine, or with one or more groups, which may be the same or different from each other, and are selected from either linear or branched C1-C5 alkyl or haloalkyl radicals, either linear or branched C1-C5 alkoxy or haloalkoxy radicals; C3-C6 cycloalkyl or cycloalkoxy radicals; C2-C5 carbalkoxy radicals; cyano radicals; methylene dioxyl radicals having the general formula (VI):    wherein: -- R7 and R8, which may be the same or different from each other, represent a hydrogen atom, a fluorine atom; a C1-C3 alkyl or haloalkyl radical. Compounds according to claim 1, in which the phenoxy radical or the thiazolic radical are substituted with one or more halogen atoms, which may be the same or different from each other, and are selected from fluorine, chlorine, bromine and iodine, or with a methyl or trifluoromethyl radical. Compounds according to claim 1, in which Ra is: isopropyl, isobutyl, sec.-butyl, tert.-butyl. Compounds according to claim 1, in which the aminoacidic radicals A, when Ra represents an alkyl radical are: L-Valine (-L[Val]-), DL-Valine (-DL[Val]) D-Valine (-D[Val]-), Leucine (-[Leu]-), Isoleucine (-[Ile)-), alloIsoleucine (-a[Ile]-), tert.-Leucine (-[Tle]-). Compounds according to claim 1, in which the aromatic penta-membered or hexa-membered heterocyclic radicals containing from 1 to 3 heteroatoms, which may be the same or different from each other, and are selected from nitrogen, oxygen and sulfur, are: pyridine, pyrimidine, pyrrole, imidazole, triazole, thiazole, oxazole, isooxazole. Compounds according to claim 1, in which L, when X represents an oxygen atom, is: methoxy, ethoxy, isopropoxy, tert.-butoxy, benzyloxy. Compounds according to claim 1, in which L, when X represents a -N(R3)- moiety, is: methylamino, isopropylamino, butylamino, octylamino, N,N-dimethylamino, piperidyl, morphol-4-yl, benzylamino, 4-chlorobenzylamino, 2,4-dichlorobenzylamino, α-methyl-4-chlorobenzylamino, α-methyl-4-bromobenzylamino, α-methyl-4-methoxy-benzylamino, α-methyl-4-trifluoromethylbenzylamino, thiazol-2-ylamino, imidaz-2-ylamino, α-cyanobenzylamino, α-cyanoisopropylamino, α-carbomethoxyethylamino, α-carboisopropoxy-ethylamino,α-carbomethoxyisobutylamino, 2-carboisopropoxypyrrolid-1-yl, α-(N-methylcarbamoyl)ethylamino, α-carbamoylethylamino, 2-(N,N-dimethylcarbamoylpyrrolid-1-yl), 2-(N,N-diinethylcarbamoylpiperid-1-yl) Compounds according to claim 1, in which L, when X represents an -N(R4)-O-moiety, is: methoxyamino, benzyloxyamino, N-methyl-N-benzyloxyamino. Compounds according to claim 1, in which K, when Y represents an oxygen atom, is: carbomethoxy, carboisopropoxy, carboisobutoxy, carbo-tert.-butoxy, carbobenzyloxy, carbophenoxy. Compounds according to claim 1, in which K, when Y represents a direct bond, is: acetyl, isobutanoyl, benzoyl, cyclopropanoyl, 2-methoxy-propanoyl, 2-acetamidopropanoyl, 2-carbomethoxyacetyl. Use as antifungal agents for agricultural purpose of the compounds according to any of claims from 1 to 12. Process for preparing the compounds according to any of claims from 1 to 12, which comprises the condensation reaction of the aminoacidic derivative (VII) and the aminoacidic derivative (VIII): in which K, A, z, B, and w have the same meaning as disclosed hereinabove (K different from hydrogen) in the presence of a condensing agent and a polar solvent, at a temperature comprised within the range of from -10°C up to room temperature. Fungicidal compositions containing one or more compounds according to any of claims 1 to 12, either alone or in the presence of solid carrier, liquid diluents, surfactants or still other active principles. Method for combatting the fungal pests consisting in applying to plants, leaves, stems, branches and roots or to the same seeds before sowing, or to the soil on which the plant grows, fungicidal compositions according to claim 15. Oligopeptidverbindungen der allgemeinen Formel (1):

        K-[-A-]z- [B-]w-L     (I)

worin - z und w 1 sind; - A entspricht einem Aminosäureteil der allgemeinen Formel (II): worin - Ra einem linearen oder verzweigten C3-C4 -Rest entspricht; - R' einem Wasserstoffatom entspricht; - B entspricht einem Aminosäureteil der allgemeinen Formel (III): worin - Rb einem Phenyl-Rest, einem aromatischem heterocyclischen-Rest oder einem Naphthyl- Rest entspricht, und worin der Phenyl-, der heterocyclischeund der Naphthylrest gegebenenfalls substituiert sein kann; einen aromatischen benzokondensierten fünfgliedrigen heterocyklischen Rest der 1 bis 2 Heteroatome enthält, die gleich oder unterschiedlich voneinander sind, ausgewählt aus der Gruppe von Stickstoff, Sauerstoff und Schwefel; worin der aromatische benzokondensierte fünfgtiedrige heterocyklische Rest auch substituiert sein kann; - m ist 1 und n ist 0 - R" entspricht einem Wasserstoff; - L entspricht einem Anteil der allgemeinen Formel (IV): worin - E einem linearen oder verzweigten C1 bis C8 -Alken oder Halogenalken entspricht; einer omega-oxa-C2-C8-Alkylkette; oder einer direkten Verbindung; - R1 einem Wasserstoffatom entspricht; einem C3-C6-Cycloalkyl; einem Phenylrest, oder einem aromatischen heterocyclischen Rest, worin die Phenyl- und heterocyclischen Reste gegebenenfalls substituiert sein können. - R2 einem Wasserstoffatom entspricht; einem linearen oder verzweigten C2-C6-Carboxyalkylrest; einem linearen, verzweigten oder cyclischen C2-C6-Carbamoylrest; einem Cyanorest; oder einem Halogenatom ausgewählt aus Fluor, Chlor und Brom; - X einem -O-Anteil; einem -N(R3)- Anteil oder einem -N(R4)-O Anteil entspricht, worin - R3 einem Wasserstoffatom entspricht; einem C1-C3-Alkyl oder Alkoxyrest; oder zusammen mit R1 einer direkte Bindung oder einer C2-C4-Alkylenkette entspricht; - R4 einem Wasserstoffatom; einem C1-C3-Alkylrest; oder zusammen mit R1 einer direkten Bindung entspricht; - K einem Wasserstoffatom entspricht; einem linearen oder verzweigten C1-C4-Alkylrest; oder einer Schutzgruppe mit der allgemeinen Formel (V): worin - Y einem Sauerstoffatom oder einer direkten Bindung entspricht; - M einem linearen, verzweigten oder cyclischen C1-C8-Alkylen oder einer Halogenalkenkette; oder einer direkten Bindung entspricht; - R5 einem Wasserstoffatom; einem gegebenenfalls substituierten Phenylrest; einem gegebenenfalls substituierten Phenoxyrest; einem gegebenenfalls substituierten Thiazylrest; einem linearen, verzweigten oder cyclischen C2-C6-Carbamoylrest; einem linearen, verzweigten oder cyclischen C1-C6-Carbalkoxyrest oder einem Cyanorest entspricht; - R6 einem Wasserstoffatom; einem C1-C3-Alkoxy- oder Halogenalkoxyrest; einem Acetatrest; einem Acetamidrest; oder einem Halogenatom ausgewählt aus Fluor, Chlor oder Brom entspricht; geeignet für die Verwendung als fungizides Agens in der Landwirtschaft. Verbindungen gemäß Anspruch 1 dadurch gekennzeichnet, dass der aromatische heterocyclische Rest ein 5- oder 6-gliedriger aromatischer heterocyclischer Rest ist, der ein bis drei Heteroatome enthält, die gleich oder unterschiedlich ausgewählt aus der Gruppe von Stickstoff, Sauerstoff oder Schwefel sein können. Verbindungen gemäß Anspruch 1 dadurch gekennzeichnet, dass der Phenylrest, der aromatische heterocyclische Rest, der Naphthylrest oder der aromatische benzokondensierte fünfgliedrige heterocyclische Rest, der ein bis zwei Heteroatome enthält, die gleich oder unterschiedlich sind und mit einem oder mehreren Halogenatomen, die ihrerseits gleich oder unterschiedlich sein können und aus der Gruppe ausgewählt aus Fluor, Chlor, Brom oder lod bestehen oder mit einer oder mehreren Gruppen substituiert sein können die gleich oder unterschiedlich voneinander sind, ausgewählt aus der Gruppe von linearen oder verzweigten C1-C5-Alkyl- oder Halogenalkylresten, linearen oder verzweigten C1-C5-Alkoxy- oder Halogenalkoxyresten, C3-C6-Cycloalkyl- oder Cycloalkoxyresten, C2-C5-Carboalkoxyresten, Cyanoresten; Methylendioxidresten mit der allgemeinen Formel (VI): worin - R7 und R8 gleich oder unterschiedlich voneinander einem Wasserstoffatom, einem Fluoratom , einem C1-C3-Alkyl- oder Halogenalkylrest entsprechen. Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, dass der Phenoxyrest oder der Thiazolrest mit einem oder mehreren Halogenatomen die gleich oder unterschiedlich voneinander ausgewählt aus der Gruppe von Fluor, Chlor, Brom oder lod oder mit einem Methyl oder Trifluormethylrest substituiert sind. Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, dass Ra Isopropyl, Isobutyl, sek.-Butyl oder tert.-Butyl bedeuten. Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, dass der aminosaure Rest A, wenn Ra einem Alkylrest entspricht, L-Valin (-L[VAL]-), DL-Valin (-DL[VAL]), D-Valin (-D[VAL]-), Leucin (-[LEU]-), Isoleucin (-[Ile]-), AllisoLeucin (-a [Ile]-). tert. Leucin (-[Tle]-) bedeutet. Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, dass der aromatische penta- oder hexa- gliedrige heterocyclische Rest ein bis drei Heteroatome enthält, die gleich oder unterschiedlich voneinander ausgewählt aus der Gruppe von Stickstoff, Sauerstoff oder Schwefel und Pyridin, Pyrimidin Pyrrol, imidazol, Triazol, Thiazol, Oxazol oder Isooxazol sein können. Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, dass L, wenn X einem Sauerstoffatom entspricht, Methoxy, Ethoxy, Isopropoxy, tert.-Butoxy oder Benzyloxy ist. Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, dass L, wenn X einem -N(R3 )-Anteil entspricht, Methylamino, Isopropylamino, Butylamino, Octylamino, N,N-Dimethylamino, Piperidyl, Morphol-4-yl, Benzylamino, 4-Chlorbenzylamino, 2,4-Dichlorbenzylamino, α-Methyl-4-chlorbenzylamino, α-Methyl-4-brombenzylamino, α-Methyl-4-methoxy-benzylamino, α-Methyl-4-trifluormethylbenzylamino, Thiazol-2-ylamino, Imidaz-2-ylamino, α-Cyanobenzylamino, α-Cyanoisopropylamino, α-Carbomethoxyethylamino, α-Carboisopropoxy-ethylamino, α-Carbomethoxyisobutylamino, 2-Carboisopropoxypyrrolid-1-yl, α-(N-methylcarbamoyl)ethylamino, α-Carbamoylethylamino, 2-(N,N-dimethylcarbamoylpyrrolid-1-yl), 2-(N,N-dimethylcarbamoylpiperid-1-yl) ist. Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, dass L, wenn X einem-N(R4)-O Anteil entspricht, ein Methoxyamino, Benzyloxyamino, N-methyl-N-benzyloxyamino ist. Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, dass K, wenn Y einem Sauerstoffatom entspricht, ein Carbomethoxy, Carboisopropoxy, Carboisobutoxy, Carbo-tert.-butoxy, Carbobenzyloxy, oder Carbophenoxy ist. Verbindungen gemäß Anspruch 1, dadurch gekennzeichnet, dass K, wenn Y einer direkten Bindung entspricht ein Acetyl, Isobutanoyl, Benzoyl, Cyclopropanoyl, 2,-Methoxy-propanoyl, 2-Acetamidopropanoyl oder 2-Carbomethoxyacetyl ist. Verwendung einer Verbindung nach einem der Ansprüche 1 bis 12 als fungizides Agens für landwirtschaftliche Zwecke. Verfahren zur Herstellung der Verbindungen nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, dass eine Kondensationsreaktion des aminosauren Derivates (VII) und des aminosauren Derivates (VIII) erfolgt: worin K, A, z, B und w dieselbe Bedeutung haben wie oben erwähnt, (K unterschiedlich zu Wasserstoff) und in Gegenwart eines Kondensationsagens und eines polaren Lösemittels, bei einer Temperatur im Bereich von -10 °C bis Raumtemperatur zusammengebracht werden. Fungizide Zusammensetzung enthaltend eine oder mehrere Verbindungen nach einem der Ansprüche 1 bis 12 alleine oder in Gegenwart von festen Trägern, flüssigen Verdünnungsmitteln, oberflächenaktiven Stoffen oder anderen aktiven Prinzipien. Verfahren zur Bekämpfung der fungiziden Pest durch die Anwendung auf den Pflanzen, Laub, Stämmen, Ästen und Wurzeln oder den Samen vor dem Säen, oder der Erde in dem die Pflanzen wachsen, und fungizide Zusammensetzungen gemäß dem Anspruch 15. Composés oligopeptidiques de formule générale (I) :

        K-[-A-]z-[-B-]w-L     (I)

dans laquelle : - z et w valent 1 ; - A représente une portion aminoacide de formule générale (II) :    dans laquelle : - Ra représente un radical alkyle C3-C4 linéaire ou ramifié ; - R' représente un atome d'hydrogène ; - B représente une portion aminoacide de formule générale (III) :    dans laquelle : - Rb représente un radical phényle, un radical hétérocyclique aromatique ou un radical naphtyle, lesdits radicaux phényle, hétérocyclique et naphtyle pouvant également être éventuellement substitués ; un radical hétérocyclique pentagonal à cycle benzo aromatique contenant de 1 à 2 hétéroatomes, qui peuvent être identiques ou différents l'un de l'autre, choisis parmi azote, oxygène et soufre, ledit radical hétérocyclique pentagonal à cycle benzo aromatique pouvant également être éventuellement substitué ; - m vaut 1 et n vaut 0 ; - R" représente un atome d'hydrogène ) - L représente un fragment de formule générale (IV) :    dans laquelle : - E représente une chaîne alkylène ou alkylène halogéné C1-C8 soit linéaire, soit ramifiée ; une chaîne oméga-oxa-alkyle C2-C8 ; ou une liaison directe ; - R1 représente un atome d'hydrogène ; un radical cycloalkyle C3-C6 ; un radical phényle, ou un radical hétérocyclique aromatique, lesdits radicaux phényle et hétérocyclique étant également éventuellement substitués ; - R2 représente un atome d'hydrogène ; un radical carboxyalkyle C2-C6 linéaire ou ramifié ; un radical carbamoyle C2-C6 linéaire, ramifié ou cyclique ; un radical cyano ; ou un atome d'halogène choisi parmi fluor, chlore et brome ; - X représente un groupe -O- ; un groupe -N(R3)-ou un groupe -N(R4)-O- ; dans lequel : - R3 représente un atome d'hydrogène ; un radical alkyle ou alcoxy C1-C3 ; ou, ensemble avec R1, il représente une liaison directe ou une chaîne alkylène C2-C4 ; - R4 représente un atome d'hydrogène ; un radical alkyle C1-C3 ; ou, ensemble avec R1, il représente une liaison directe ; - K représente un atome d'hydrogène ; un radical alkyle C1-C4 soit linéaire, soit ramifié ; ou un groupe de protection de formule générale (V) :    dans laquelle : - Y représente un atome d'oxygène ; ou une liaison directe ; - M représente une chaîne alkylène ou alkylène halogéné C1-C8 soit linéaire, soit ramifiée ou encore cyclique ; ou une liaison directe ; - R5 représente un atome d'hydrogène ; un radical phényle éventuellement substitué ; un radical phénoxy éventuellement substitué ; un radical thiazolique éventuellement substitué ; un radical carbamoyle C2-C6 linéaire, ramifié ou cyclique ; un radical carbalcoxy C1-C6 linéaire, ramifié ou cyclique ; ou un radical cyano ; - R6 représente un atome d'hydrogène ; un radical alcoxy ou alcoxy halogéné C1-C3 ; un radical acétate ; un radical acétamidique ; ou un atome d'halogène choisi parmi fluor, chlore et brome ;    adéquats pour être utilisés à titre d'agents antifongiques en agriculture. Composés selon la revendication 1, dans lesquels le radical hétérocyclique aromatique est un radical hétérocyclique aromatique pentagonal ou hexagonal contenant de 1 à 3 hétéroatomes, qui peuvent être identiques ou différents les uns des autres, choisis parmi azote, oxygène et soufre. Composés selon la revendication 1, dans lesquels le radical phényle, le radical hétérocyclique aromatique, le radical naphthyle ou le radical hétérocyclique pentagonal à cycle benzo aromatique contenant de 1 à 2 hétéroatomes, qui peuvent être identiques ou différents l'un de l'autre, sont substitués par un ou plusieurs atomes d'halogène, qui peuvent être identiques ou différents les uns des autres, et sont choisis parmi fluor, chlore, brome et iode, ou par un ou plusieurs groupes, qui peuvent être identiques ou différents les uns des autres, et sont choisis soit parmi des radicaux alkyle ou alkyle halogéné C1-C5 linéaires ou ramifiés, soit parmi des radicaux alcoxy ou alcoxy halogéné C1-C5 linéaires ou ramifiés ; les radicaux cycloalkyle ou cycloalcoxy C3-C6 ; les radicaux carbalcoxy C2-C5 ; les radicaux cyano ; les radicaux méthylène-dioxyle de formule générale (VI) :    dans laquelle : - R7 et R8, qui peuvent être identiques ou différents l'un de l'autre, représentent un atome d'hydrogène, un atome de fluor ; un radical alkyle ou alkyle halogéné C1-C3. Composés selon la revendication 1, dans lesquels le radical phénoxy ou le radical thiazolique sont substitués par un ou plusieurs atomes d'halogène, qui peuvent être identiques ou différents les uns des autres, et sont choisis parmi fluor, chlore, brome et iode, ou par un radical méthyle ou trifluorométhyle. Composés selon la revendication 1, dans lesquels Ra est : isopropyle, isobutyle, sec-butyle, tert-butyle. Composés selon la revendication 1, dans lesquels les radicaux aminoacides A, lorsque Ra représente un radical alkyle, sont : L-Valine (-L[Val]-), DL-Valine (-DL[Val]), D-Valine (D[Val]-), Leucine (-[Leu]-), Isoleucine (-[Ile]-), alloIsoleucine (-a[Ile]-), tert-Leucine (-[Tle] -). Composés selon la revendication 1, dans lesquels les radicaux hétérocycliques pentagonaux ou hexagonaux aromatiques contenant de 1 à 3 hétéroatomes, qui peuvent être identiques ou différents les uns des autres, et choisis parmi azote, oxygène et soufre, sont : pyridine, pyrimidine, pyrrole, imidazole, triazole, thiazole, oxazole, isooxazole. Composés selon la revendication 1, dans lesquels L, quand X représente un atome d'oxygène, est : méthoxy, éthoxy, isopropoxy, tert-butoxy, benzyloxy. Composés selon la revendication 1, dans lesquels L, quand X représente un groupe -N(R3)-, est : méthylamino, isopropylamino, butylamino, octylamino, N,N-diméthylamino, pipéridyle, morphol-4-yle, benzylamino, 4-chlorobenzylamino, 2,4-dichlorobenzylamino, α-méthyl-4-chlorobenzylamino, α-méthyl-4-bromobenzylamino, α-méthyl-4-méthoxy-benzylamino, α-méthyl-4-trifluorométhylbenzylamino, thiazol-2-ylamino, imidaz-2-ylamino, α-cyanobenzylamino, α-cyanoisopropylamino, α-carbométhoxyéthylamino, α-carboisopropoxy-éthylamino, α-carbométhoxyisobutylamino, 2-carboisopropoxypyrrolid-1-yle, α-(N-méthylcarbamoyl)éthylamino, α-carbamoyléthylamino, 2-(N,N-diméthylcarbamoylpyrrolid-1-yle), 2- (N,N-diméthylcarbamoylpipérid-1-yle). Composés selon la revendication 1, dans lesquels L, quand X représente un groupe -N(R4)-O-, est : méthoxyamino, benzyloxyamino, N-méthyl-benzyloxyamino. Composés selon la revendication 1, dans lesquels K, quand Y représente un atome d'oxygène, est : carbométhoxy, carboisopropoxy, carboisobutoxy, carbotert-butoxy, carbobenzyloxy, carbophénoxy. Composés selon la revendication 1, dans lesquels K, quand Y représente une liaison directe, est : acétyle, isobutanoyle, benzoyle, cyclopropanoyle, 2-méthoxypropanoyle, 2-acétamidopropanoyle, 2-carbométhoxyacétyle. Utilisation comme agents antifongiques en agriculture des composés selon l'une quelconque des revendications 1 à 12. Procédé de préparation des composés selon l'une quelconque des revendications 1 à 12, qui comprend la réaction de condensation du dérivé aminoacide (VII) et du dérivé aminoacide (VIII) : où K, A, z, B et w ont la même signification que celle décrite ci-dessus (K différent de l'hydrogène) en présence d'un agent de condensation et d'un solvant polaire, à une température comprise dans la plage de -10°C à la température ambiante. Compositions fongicides contenant un ou plusieurs composés selon l'une quelconque des revendications 1 à 12, soit seuls, soit en présence d'un véhicule solide, de diluants liquides, de tensioactifs ou encore d'autres principes actifs. Méthode de lutte contre les attaques fongiques qui consiste à appliquer aux plantes, aux feuilles, aux tiges, aux branches et aux racines ou aux semences mêmes avant de semer, ou au sol sur lequel la plante pousse, des compositions fongicides selon la revendication 15.